A small, usually gasoline-powered engine mounted above the rear bicycle wheel and using a curler to transmit energy on to the tire constitutes this sort of propulsion system. A easy centrifugal clutch engages the curler with the tire when the engine reaches a sure pace, propelling the bicycle ahead. Variations exist, together with some fashions utilizing a friction wheel in opposition to the entrance tire.
This easy design gives a number of benefits. Its simplicity interprets to ease of set up and upkeep, typically requiring minimal instruments and mechanical experience. The comparatively low price in comparison with different motorized bicycle choices makes it a horny entry level. Traditionally, such techniques have supplied a available and inexpensive technique of motorized transport, significantly in areas with restricted entry to extra complicated automobiles.